Apparatus for shearing sheep and similar uses



Oct. 5 1926. 1; A. MARTIN APPARATUS FOR SHEARING SHEEP AND SIMILAR USES Filed p 24, 1924 2 Sheets-Sheet 1' INVENTOR: ALBERT MARTIN,

y his Attorne V A. MARTIN APPARATUS FOR SHEARING SHEEP AND SIMILAR USES Filed p' 24, 1924 2 Sheets-Sheet 2 I INVENTOR:

AIBERT MARTIN,

Patented ct. 5, 192%.

ALBERT MARTIN, OF LONDON, ENGLAND.

APPARATUS FOR SHEARING' Application filed September 24, 1924, Serial No.

This invention relates to apparatus such as sheep shearers, horse clippers and the like, in which a to and fro movement is imparted to a cutter plate by means of an actuating arm fast on a spindle, a presser plate being inserted between the cutter plate and the actuating arm, so that the pressure between the cutter plates may be adjusted through the spindle- The object of this invention is to provide an improved type of apparatus which is easier to manipulate and is less likely to cause trouble due to wear in the reciprocating parts, owing to its simplicity of'construction, and moreover which is provided with more than one means for adjusting the pressure between the cutter plates.

According to this invention the cutter consists of a spindle, fast on which is an actuating arm caused to oscillate in the usual manner, top and bottom cutter plates, a presser plate or plates interposed between the end of said actuating arm and the top cutter plate and two separate manually operable means for adjusting the pressure between the top and bottom cutter plates.

In one construction the presser plate extends around the spindle and a pin is provided on the actuating armwhich engages a hole in the presser plate so that the oscillatory movement of the actuating arm may be transmitted thereto, pins also being provided on the resser plate for transmitting the motion to the top cutter plate.

The first means of adjustment is carried out in the usual manner in which one'end of the spindle is mounted in a bearing cap, adjustable vertically so that any wear between the plates may be taken up by adjusting the position of the cap. The other hearing for the lower end of the spindle is formed by a hole in the lower part of the frame. The second means of adjustment may consist of a screw that causes the presser plate to move about the front end of the actuating arm which acts as a fulcrum, so bringing further pressure upon the top cutter plate or in a second construction in which the movement of the top cutter plate is controlled by parallel and equal links, the pressure exerted by the presser plates may be adjusted by means of the screws securing the links to the cutter plate.

A further feature of thisinvention is that the bottom cutter plate may be secured to a steel plate which is secured to the alumini- SHEEP AND SIMILARUSES.

739,549, and in Great Britain October 2, 1923.

panying drawings, of which Figure 1 is a i plan, Figure 2 a longitudinal section and Figure 3 a transverse section of f a sheep shearer on line 3-3 of Figure 1.

Figure 4 is a detailshowing the use of ball bearings.

Figure 5 is a vertical section of a modification of the top bearing for the spindle.

t Iiigure 6 is a top plan of another form of Figure 7 is a vertical section of the same.

Figure 8 is a section on the line 88 of Figure 6.

Figure 9 is a plan view of an upper presser plate.

Figure 9 is a longitudinal section of the same. I

. Figure 9 is a transverse section of the same. a

Figuresl0, 10 and 10 are corresponding views of a lower presser plate.

Figure 11 is a section showing theuse of a skew gear for operating the tool.

A' is a handle or frame through which passes a shaft B which can be rotated by any convenient mechanism and. which has at its front end a crank pin B provided with an anti-friction roller B this roller lies between two cheeks C carried by an arm C fast on a'spindle D. Thus as the shaft B is rotated, the arm C is rocked about the axis I of the spindle D through a small angle. The handle or frame A is preferably formed of aluminium for the sake of lightness and in the lower part ofthe front of the frame is fitted a steel plate E to which the bottom cutter plate F is secured by screws E G is the top cutter plateand-H is the presser plate which is interposed between the plate G and the end of arm C. The rear of this presser plate is connected by a screw H to the arm G and a pin C on the front of the arm engages a hole in the plate H so that as the arm rocks about the axis of the spin dle D, the plate H is also rocked. At the front of the plate H are two pins H which engage holes in the top plate G so that this plate is rocked by the movements of the arm C to cause its teeth to move over the teeth of the bottom plate and thus to cut the ma terial into which the teeth of this bottom plate are thrust.

The rear of the bottom plate has in it slots through which the screws E pass to allow of the teeth on the bottom plate being adjusted with respect to those on the top plate, that is, to vary the amount by which the top teeth overlap the bottom teeth.

Preferably the bottom plate is so set that the roots of its teeth are never covered by the roots of the teeth of the top plate, as I find that this allows the teeth to .enter the wool or other material with freedom and shearing or the like is thus more easily effected.

The spindle D can rotate in a bearing cap D which can be screwed into the frame A as is clearly seen in Figure 2 and the lower end of the spindle is mounted in a hole formed in the steel plate E. Thus by screwing the cap D into the frame A the pressure of the presser plate H on the top plate G can be increased. A final adjustment of the pressure may be made by tightening the screw H on the arm C. Two separate means-for adjusting the pressure between the top plate H and the bottom plate F are thus provided.

The presser plate H is preferably slit to increase. the spring action thereof upon the top plate G.

It will be seen from an inspection of Fig 'ure 2 that the arm C is not parallel to the bottom cutter plate F but is set at an angle thereto and the cheeks C are set at an angle to the arm C so as to allow the handle A to be set at a considerable angle to the bottom plate F. I lind that such an arrange mcnt is easier to use than one in which the handle is more or less in line with thebo tom plate.

t will beunderstood that the shape of the teeth on plates F and G may be varied as desired to suit the work for which the tool is intended.

Figure 4.- is a detail showing how ball bearings B may be provided for the shaft E.

Figure 5 is a detail view showing a modified form of the top bearing of the spindle D. In this form the cap D which screws into the frame A, has within it a ball race D between which and the bearing proper D are interposed balls D Figure 6 is a plan of amodified tool in which the presser plate does not extend round the spindle, Figure. 7 is a longitudinal section thereof and Figure 8 a trans Verse section on the line 8-8 of Figure 6.

In this tool the top cutter plate G is moved to and fro directly by the pin C on the front of the arm 0 engaging a slot in the plate G which is connectedto the frame A by curved longitudinally, while the. lower plate K which is shown separately in Figures 10, 10 and 10 is curved transversely.

It will be understood that by adjusting the bearing cap D the pressure transmitted from the arm (3 to the plate G can be varied.

y no top cutter plate is secured to the links J by screws L which also serve to ad'ust the pressure exerted by the presser plates K on the top cutter plate, whereby a second means for usting the pressureis provided.

The front of the plate K is bent up at right angles.

it will be understood that in any of these forms the shaft may be rotated by hand or by power; in the latter case 1 preferably employ skew gear to transmit the motion as this prevents undue vibration reaching the hand of the operator. Such an arrangement is illustrated in Figure ll where the shaft 13 has on its outer end a wheel 13* with skew teeth and this meshes with skew teeth P out on the end of a transverse shaft ,P which can be rotated by a small electric motor, for instance.

hat I claim is in a cutting tool the combination of a frame, a toothed plate fixed thereto, a movable toothed plate, a spindle, an arm fast on the spindle and adapted to actuate the movable toothed plate, a presser plate extending around the spindle. and interposed between the end of said arm and the movable toothed plate, pins on the presser plate on gaging the movable toothed plate, another pin on the actuating arm engaging the presser plate, a cap on the spindle adapted to regulate the pressure between the two toothed plates, a screw at the rear of the presser plate for bot securing the presser plate to the arm and forming a second means for adjusting the pressure between the toothed plates.

In testimony that I claim the foregoing as my invention, .1 have signed my name this 12th dayof September, 1924.

ALBERT M TIN 

